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SEQUOIA ANALYTICAL <br /> 1900 Sates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> reatian Engineering, Inc Client Project ID Unocal #6015, 601 E Kettleman Ln , Lodi <br /> 1 Stanwell Dr, Ste 400 Matrix Water <br /> Concord, CA 94520 <br /> Attention Avo Avedesslan QC Sample Group 3091451-59 Reported Oct 12, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst J F J F J F J F <br /> Conc Spiked 20 20 20 60 <br /> Units ug/L fig/L ug/L ug/L <br /> LCS Batch# 2LCS100793 2LCS100793 2LCS100793 2LCS100793 <br /> Date Prepared 10/7/93 10/7/93 10/7/93 10/7/93 <br /> Date Analyzed 10/7/93 10/7/93 10/7/93 110/7/93 <br /> Instrument I D # HP 4 HP-4 HP 4 HP-4 <br /> LCS <br />. Recovery 101 99 101 103 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # 3091299 3091299 3091299 3091299 <br /> Date Prepared 10/7/93 10/7/93 10/7/93 10/7/93 <br /> Date Analyzed 10/7/93 10/7/93 10/7/93 10/7/93 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Matrix Spike <br /> % Recovery 100 100 100 102 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 100 100 102 <br /> Relative % <br /> Difference 00 00 00 00 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents <br /> L preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the 0C limits for MS/MSDs are advisory only <br /> and are not used to accept or reject batch results <br /> Alan emp <br /> Project Manager) <br /> 3091451 KEI a3> <br />